Pneumatic pump.



PUR-'ER iCArioN. ULEB FES. 28 w16.

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"UNTTETE STATES PATENT @FFTQEQ CHARLES A. DE RIGNE, OF LOS ANGELES, CALIFORNIA.

PNEUMATIC PUMP.

Application led February 28, 1916.

To ZZ whom t 11i/ay concern:

Be it known that I, CHARLES A. DE Rioxn, a citizen of the United States, residing at Los Angeles` in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Pneumatic Pumps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to pneumatic pumps and more particularly to that general class of pumps especially designed for intlating the tires of automobiles, bicycles and the like.

It is well known that in using a hand pneumatic pump of the ordinary construction, the lcylinder and other working parts of the pump become heated to a comparatively high temperature, dueto the fact that under compression the temperature of the air is raised. This becomes very annoying to the person using the pump, as oftentimes the cylinder gets too hot to be handled with bare hands.

The present invention is primarily designed to overcome this annoyance, and to this end, it consists of a jacket surrounding the cylinder through which the cool air is drawn prior to being compressed and forced into the tire, or thereafter used in any other manner.

Another object of the invention is to provide a pneumatic pump of simple, compact and durable consti'uctiomand one which is eliicientand reliable in operation.'

Further objects and advantages of the invention will appear in the following description, it being understood that various changes in form, proportion, and the minor details of construction may be resorted to within the scope of the appended claim.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and aecompanying drawings, in which 2- l `igure 1 is a side elevation of a pneumatic pump constructed in accordance with this invention; Fig. 2 is a vertical longitudinal sectional view of the lower portion of the same; Fig. 3 is a horizontal sectional view taken on the plane of the line 3 3 of Fig. the valve being removed; Fig. '-t 'is a bottom plan view of a portion of the base of the pump detached; and Fig. 5 is a hori- Specication of Letters Patent.

Patented Dec. 26, 119MB.

Serial No. 81,030.

zontal sectional View taken the line 5-5 of Fig. 1.

Corresponding and like parts are referred to in the following description and indicated in all of the views of the drawings by the same reference characters.

In the embodiment illustrated, the reference character 1 designates a foot plate or stirrup having a pair of upwardly extending and converging arms 2, the free upper ends of which are integrally connected with the base of the pneumatic pump. This base comprises a short hollow cylinder 3, to the upper end of which is threaded an annular iange 4 of a casting 5, having a centrally arranged opening G therein and an annular series of air ducts 7 leading into the hollow portion or chamber 8 of the base. Extending upwardly from the upper end of the casting 5 is a tubular sleeve 9, into which is inserted the cylinder 10 of the pump, said cylinder being retained in place in any convenient manner. Communicating with the lower end of the cylinder 10 and arranged in the casting 5, is an air outlet passage 11, the outer end of which communicates with an internally threaded nipple 1Q. This nipple 12 is adapted to receive the externally threaded nipple 13 which is swiveled in an elbow 11 secured to the lower end of an air tube 15.

The outside of the tubular sleeve S) is provided with a series of longitudinally extending circumferentially spaced ribs 16, and tightly contacting with the outer sides of these ribs 16 is a tubular jacket 1T, whereby the latter is spaced (.-oncentrically around the cylinder 10` the upper ends of the aforesaid air ducts 7 communicating with the air passages formed between the ribs 1G, as most clearly shown in Fig. 8 of the drawings. Arranged at the upper end of the jacket 17 is a cap 18. the latter being provided with an air inlet in the form of an annular series of circular apertures 19.

Secured within the opening 8 in the casting 5 is an externally threaded bushing 20, the upper end of which is provided with a conical valve seat 21 which receives a conical valve having a stem 23 depending from the lower side of the same and extending through a suitable guide 21 arranged concentrieally within the bushing` andsecured therein by .suitable arms The lower end of the valve stem Q3 is provided with a stop member against the upper on the plane ofedge of which rests the lower end of a coiled spring 27. This coiled spring surrounds the stem .23 and has its upper end disposed in contact With the lower end ot the guide Q4, whereby to normally retain the valve 22 in closed position. Reciprocating within the cylinder 10 is a suitable piston 28 having a rod 29 extending upwardly therefrom through a centrally arranged aperture in the cap 30 of the cylinder'. This cap 30 is provided with an annular series oi openings 31 to allow air to be sucked into the interior of the cylinder and Jforced out through the same when the piston is reciprocated.

in the operation, the free end of the air tube 15 is connected to the inilating valve of a lbicycle tire and the piston is reciprocated. a suitable handle 32 being secured to the upper end ot the piston rod 2S) tor this purpose. As the piston is moved downwardly. the air contained beneath it in the cylinder is forced out through the outlet passage ll and through the air tube l5, the valve 22 being then in closed position. As the piston is moved upwardly, the inwardly opening intlating valve of the bicycle tire is in closed position as will be understood, and the air contained in the chamber 8 will he drawn through the valve 22 into the pump cylinder' l0. 'this causes air to be drawn through the inlet openings 19 in the cap 18 into the jacket 17, from whence it is drawn through the air ducts 7 into the, aforesaid chamber. The air thus passing through the jacket 1T around the lower end of the cylinder l0 will retain the cylinder and the other working parts at a low temperature, as Will be readily understood without further description.

From the foregoing description, taken in connection with the accompanying drawings, the operation of the invention will be readily understood without ay more extended eX- planation.

It will alsov he seen that the pump is so constructed that the several parts thereof may be readily detached to permit repairs or replacement of any part when necessary.

l claim In an air pump, the combination of a hollow hase having a tubular sleeve extending from the upper end thereof, a cylinder fixed at its lower end to said base. a valve opening,r inwardly into the lower end oi' said cylinder from the interior of said base, longitudinally extending circui'nferentially spaced ribs on the outer side ot' said sleeve, a tubular j acket surrounding` said cylinder and said sleeve and having an air inlet therein, the inner side of said jacket engaging the outer sides of said ribs, said hase being provided with an annular series ot air' ducts leading from the interior thereof into the lower end ot said jacket and an air outlet passage leading from the lower end of said cylinder, and a piston reciprocating in said cylinder.

ln testimony whereof' l have hereunto set my hand in presence of two subscribing witnesses.

CHRLES A, DE RGNE.

Vilitnesses FRANK F. Hummm, lavan O. Fanrss. 

